Process of weighting silk with hæmatoxylin.



ii a. if h lt -lERANZ MUELLER, 01F ZURICH, SWITZERLAND.

PROCESS OF WEIGHTING SILK WITH HEMATOXYLIN'.

No Drawing.

To all whom it may concern:

Be it known that I, FRANZ MUELLER, a

citizen of Germany, residing at 18 Ottikerstrasse, Zurich 6, Switzerland, have invented a new and useful Process of Weighting Silk with Haematoxylin; and I do hereby declare the following to be a full, clear, ad exact description of the same.

This invention relates to the process of weighting silk with haematoxylin.

It is known that haematoxylin has been employed as a means for loading or weighting silk. For this purpose the method has always been to subject the silk to preliminary treatment of one kind or another and then to manipulate it in a hot bath of hacmatoxylin and soap.

It has now been found that an addition of water soluble phosphates to the haematoXylin bath presents sundry advantages, whether in presence of soap or without soap. In this way a considerably higher increase of weight can be effected without other disadvantages, and the weighted silk is made firmer and gets a better grip by the proposed means.

Example: The boiled or scoured silk is preferably weighted beforehand by the generally known methods with zinc hydrate, phosphate or phosphate-silicate; it is then manipulated at about 50 C. in a Warm bath of, for example, 100 parts haematoxylin and 50 parts or more of sodium phosphate with a gradual raising of the temperature of the bath, until the desired weighting is reached. The bath can be preserved and after addition of fresh haematoxylin and phosphate can be used again, which is not practicable if soap is employed. The quantities of haematoxylin and phosphate depend upon the previous treatment of the silk and upon the weighting desired. Soap may also be added to the above mentioned bath. The nearer this preliminary weightingviz. the treatment with zinc-phosphate preceding that with haematoxylin-is equal to the required final weighting, the less haematoxylin and sodium phosphate less will be the percentage of sodium phosphate relatively to haematoxylin, while on the other hand, the greater the difi'erence is Specification of Letters Patent.

Application filed November 29, 1913. Serial No.

with the same will be added and the Patented Dec. 112, 19%..

between the preliminary and final treatments, the more haematoxylin and phosphate is added. In this case again there is obtained by the addition of phosphate and quantity of haematoxylin a higher weighting than when only haematoxylin and soap are used. Consequently the proposed means, viz. the presence of soluble phosphate salt in the weighting bath itself, means a valuable improvement even in the known processes of weighting by means of haematoxylin and soap.

I claim:

l. A process consisting in treating silk with a bath of hzematoxylin and sodium phosphate.

2. A process consisting in treating silk with a bath of haematoxylin and sodium phosphate at about 50 C. V

3. A process consisting in treating silk with a bath of haematoxylin and sodium phosphate at about 50 C.; and increasing the temperature of the bath.

l. A process of weighting silk consisting in treating the silk with a bath of 100 parts haematoxylin and 50 parts sodium phosphate at about 50 C.; and increasing the temperature of the bath.

A process of weighting silk consisting in manipulating the silk at about 50 C. in a warm bath of 100 parts haematoxylin and 50 parts sodium phosphate; and gradually increasing the temperature of the bath.

6. .A process of weighting silk consisting in giving the silk a preliminary weighting; manipulating the silk at about 50 C. in a warm bath of 100 parts hacmatoxylin and 50 parts-sodium phosphate; and gradually increasing the temperature of the bath until the desired weighting is reached.

7. A process of weighting silk by means of haematoxylin in which process soluble phosphates are present in the haematoxylin itself and soap is added.

In testimony whereof, I have signed my name to this specification in the presence of two subscribing witnesses.

- FRANZ MUELLER. Witnesses:

CARL Gunman,

Auousr vRenee. 

